植被刈割对红壤酸度及有机无机复合状况的影响  

EFFECTS OF CUTTING FREQUENCY OF NATURAL VEGETATION ON ACIDITY AND ORGANO-MINERAL COMPLEX IN RED SOILS

作　　者：曾希柏[1] 刘更另[1] 

机构地区：[1]中国农业科学院农业自然资源和农业区划研究所山区研究室,北京100081

出　　处：《土壤学报》2000年第2期225-232,共8页Acta Pedologica Sinica

基　　金：国家自然科学基金!49631010;中国博士后科学基金!中博基(1997)7号

摘　　要：在红壤地区自然植被（白茅）条件下，不同的对割周期对土壤交换性盐基离子组成、土壤有机质、有机无机复合体、腐殖质组成及铁、铝氧化物含量等均具有较大的影响。从1年刈割一次至6年刈割一次处理，虽然土壤酸度的变化无明显规律，但土壤交换性钾、无定形铁、无定形铝、络合态铁的含量及铁活化度值均呈增加趋势，且土壤有机质和复合体的含量相应增高，松结态腐殖质／紧结态腐殖质的比值亦增大，即腐殖质的活性较强、质量较高，土壤肥力在一定程度上得以进化；而交换性钠、交换性钙及游离铁、铝氧化物的含量则呈相应的下降趋势。Based on the long-term experiments of different cutting frequency of naturalvegetation (Imperata cylindrica var. major), in red soils of south of Hunan Province,the changes of contents of organo-mineral complex,acidity and Fe, Al oxides werestudied. The results showed that the changes of the soil acidity were not any regular,but the contents of organic matter, organo-mineral complex, exchangeable K, amorp-hous Fe and Al, complex Fe and value of loosely combined / tightly combined,achvation degree of Fe in the soil had a tendency of increasing, whereas the contentsof exchangeable Na and Ca, free Fe and AJ were decreased relahvely when thecutting frequency beAnents from one year to 6 years.

关 键 词：刈割 土壤酸度 有机无机复合 红壤 水土保持 

分 类 号：S157.433[农业科学—土壤学]